In the wild, a dingo dog would kill and gorge on the food available, then posssibly not eat fro days - their digestive systems are geared to accommodate that. But the domestic dog is not wild. It needs regular meals every day. Some people give only one meal a day, some add in a few biscuits at another time which might be tea or breakfast. I feed a dry complete food with low protein and add in some tinned food, or raw mince, or scraps from the table. I prefer to feed twice a day, breakfast and tea, with a chew at bedtime